Disk wheel



Aug. 1o A1926.

1,595,651` G. H. FoRsYTH v DISK WIiEEL Original Filed March 24, 1922 j/Patented Aug. 10, 1926i UNITED STATES PATENT OFFICE..

GEORG-EVE. FOBSYTH, OF SAN MATEO, CALIFORNIA, ASSIGNOR TO STEEL WHEEL COB- PORATION, F LANSING, MICHIGAN,A CORPORATION OF MICHIGAN.

nisx WHEEL.

original application -led March 24, 1922, lSerial No. 546,272. Divided and Ithis vapplication iiled 3 y september 3o, 1925. serial No. 59,471.

This application is a division of my copending application Serial No. 546,272 filed March 24, 1922.

This invention has for its primary ob- 5 ject the adaptation of a disk wheel for the y provision of strength, resiliency, pleasing contour and convenience of assembly of the hub, disk, body and rim, together With ease of access to the usual straight valve stem of the tire for iniiating without impairing these features of the wheel.

It is recognized that a'dished disk, preferably reversely .curved in radial section, has greater resistance as a wheel body to both diametric 'and lateral strains and also greater capacity for recovery from defer-- mation than has a flat disk whether disposed parallel to the wheel plane or at an inclination.

The employment of a disk of such curva'- ture to the hub and rim in such relation as to conserve the important qualities of resilience,strength, resistance to diametric and lateral stresses and recovery from deforma- '25 tion introduces difficulty by way ofinterference between the disk and the usual valve stem, and many expediente have been resorted to for overcoming or minimizing the same, such as, for instance, providing deep 3o pockets in the wheel facean-d housing therein a horizontally projecting angular valve stem, aperturing the disk and projecting the valve stem therethrough, disposing the valve stem at an inclination to the wheel plane, etc.v

My invention provides access from the front of-the wheel to a straight valve stem disposed in the wheel plane Without materially altering the disk contour and Without Weakeniiigrthe saine by slotting or perforating the disk inwardly of the rim While utilizing a dislicd disk of reversely curved radial section.

l TheJ invention also presents the advantage of capacity for lateral Withdrawal of the rim, tire and valve steam from the Wheel Withoutmecessity of lifting the same axially to free the stein from the disk, and the protection of the valve stem by the overlying rim-retaining element at the front of the Wheel.

Another feature is the subjecting of the disk vto radial compressive stress by means of lateral deformation in the hub zone.

Other advantages f ofy the invention, Whether'embodied in a Wheel equipped with demouiitablc rim, or with fixed rim and demountable at the lhub will b e apparent to those skilled in ,the-art. vIn order that 'the invention may be readily undeistood and appreciated, I have illustrated 'the same in the .accompanying drawings as embodied in two disk wheels of different contour and inthe accompanying description based upon such illustrations have set forth the detailed features of such embodiments. It is to be-understood, however, that these -two examples are given by Way o f eXempliiication only and the invention is not to be construed as limited thereby.

In the dravvings- D Figs. 1 and 2 are'radial sections through disk Wheels of slightly different .contour illustrating the embodiment of the invention therein.

Having particular reference to Fig. 1 of the drawing the pressed steel hub 11 having an vintegral rear radially projecting flange 12 is assembled by means of the removable front iiange or plate 13 and the bolts 14 with the single dished disk 15. It Will be observed that the curvature of the central p0rtion of the disk lying adjacent the flan-ge 12 is slightly diiferent from that of the flange at the point 16 with the result that as the hub iianges and disk are assembled contact is first obtained at 17 near the periphery of the iiange 12 whereby the tightening iof the bolts 14 serves to radially stress the disk body and to insure a firin'bearing support for the diskV at the oint 17.

Outwardly beyon the hub connection the disk curves to the rearand again to the front presenting'a forwardly concave surface in its medial or body portion, with a forwardly projecting shoulder or bead 18 whence the disk extends in lits peripheral portion radially and then rearwardly at 19 to an inclined marginal portion 2() which constitutes a rear support for the rim 21, in this case shown as demountable. The

forward edge of the rim 21 is supported by a rim-retaining member 22 here shown 'as a ring, although as an e uivalent construction individual separated c ips or other rim-retaining means may be employed. 'Ihe ring 22 has its inner portion fulcrumed at 23 upon the shoulder 18 of the ldisk 15.

At a point corresponding to the location of the valve stem 24 the rim-retaining ring 22 is notched at 25 and the valve stem 24 extends through said notch and is closed by the cap 26 which bears at its upper edge 'uponthe lower horizontal portion of the present the concave intermediate or body l with suchmedian plane.

portion provided with a bead or shoulder 33 and thence extends in its peripheral portion radially and rearwardly to the inclined supporting margin 34. As in the former case the rim 21 is supported at its front edge by the rim-retaining element 35, here shown as a ring fulcrumed at its inner edge 36 upon the beaded portion 33 of thedisk.

In this form of construction it will be observed that that portion of the disk' adjacent the lvalve stem 24 extends forwardly across the median plane of impact of the wheel and thus forwardly beyond the valve stem, the axis of which normall coincides This is true throughout the disk except 4at the point where the valve stem is located. Here the disk isradially recessed as illustrated at 37 and the valvestem lies within such recess, its lower end covered by the cap 38 extending inwardly for a considerable distance.

As shown in both Figs. l and 2, it will be observedl that, as distinguished from a radially corrugated disk, vthe front contour of the disk body is plain, having a front sur-- lface generated by the revolution about the` wheel axis of a line angularly projected therefrom, whether such line be straight orv curved in the 'planeof the wheel axis.

In Fig. 1 it will be seen that each portion of the disk 15 is at the rear of the median .plane of wheel impact, while in Fig. 2 the central and peripheral portions of the disk extendacross the median plane-.of impact itself recessed to accommodate the valve stem.' In neither case is the disk weakened by perfora-ting or, slotting the same to accommodate the valve stem, and yetthe valve stem is brought to the front of the disk and is made readily accessible for intlating purposes.

It willbe seen that throughout that portion of the valve stem adjacent the rim, where most subject to injury from bad roads, stones and the like, the rim-retaining element overlies the valve stem as a protective covering while leaving the inner inflation end accessible for inflation. i

It will also be observed that whether the tire carrying the valve stem is to be removed from a fixed rim as in case of needed repair or whether a demountable rim carrying the tire is to be removed from the wheel, in"""' either case after tl e removal of the rim-retaining ring or clips the tire can be withdrawn from the wheel laterally without the. necessity of lifting the valve stem radially out of an aperture of the disk or from behind an imperforate disk.

Thus the employment of a straight valve stem in connection with a perforate disk of the reversely curved type, is made compatible with accessibility of the valve stem for inflation from the front and associated with the feature of ready withdrawal laterally.

I claim:

1. In a disk Wheel, the combination of a central hub portion, a peripheral tire-carrying portion, and an intermediate disk body portion, the wheel provided at the hub with a radially projecting disk supporting member, and means to clamp the disk to the supporting member, the contour of the overlapping portions of the disk and supporting member being diverse to the extent that when forced together the disk will first contact the peripheral portion of the support and be slightly deformed to effect and maintain a tight fit under stress.

2. In a wheel, the combination of a cen# tral hub portion, a peripheral tire-carrying portion, and an intermediate disk body portion, thewheel provided at the hub with a radially projecting disk supporting memv ber, the contour of the overlapping portions of the disk and supporting mem'lier being diverse to the extent that when forced together the disk will first contact the peripheral portion of the support and be slightly deformed to effect and maintain a tight lit and to place the body portion of the disk under stress radially applied.

3. In a wheel, the combination of a central hub portion, a peripheral tire-carrying portion, and an intermediate disk body portion, the disk body at the hub clamped between front and rear supporting members projecting radially from the hub proper into overlapping relation with the disk, the contour` of the overlapping `disk andsupporting inembers being diverse to the extentthat when forced together the disk will rst Contact with the peripheral `portions of the l supporting membersv and be vslightly deformed to effect andmantain a'tight it under stress.

In testimony whereof I have hereunto signed my name.

GEORGE H. FORSYTH. l p 

